The present invention provides an apparatus for producing casting mould parts by compacting mould material between a first squeeze plate and a second squeeze plate forming movable end walls of a moulding chamber, which subsequent to the compacting can be opened by moving the second squeeze plate out of the way, after which the mould part can be pushed out of the moulding chamber by a further movement of the first squeeze plate in its compacting direction, the movement of the first squeeze plate being provided by a hydraulic drive unit comprising a movable cylinder member connected to the first squeeze plate and an associated stationary piston member having a piston rod extending tightly through an inner wall of the cylinder member and a piston. The movable cylinder member is guided in its linear movement by the piston and by the piston rod. By further providing supplementary means for guiding the movable cylinder member, it is possible to reduce the sag of the piston rod and cylinder member, when the cylinder member is advanced to the full extent to push out the produced mould part and improve the rigidity of the first squeeze plate against tilting movement during compacting.
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1. Apparatus for producing casting mould parts by compacting mould material between a first squeeze plate and a second squeeze plate forming movable end walls of a moulding chamber, which subsequent to the compacting can be opened by moving the second squeeze plate out of the way, after which the mould part can be pushed out of the moulding chamber by a further movement of the first squeeze plate in the compacting direction thereof, said apparatus comprising:
a frame;
a hydraulic drive unit which provides the movement of the first squeeze plate, said drive unit comprising
a movable cylinder member connected to the first squeeze plate and
an associated stationary piston member having (a) a piston rod including a distal end and a connection between said distal end and said frame which said connection is rigid and which inherently prevents movement between said distal end and said frame regardless of any other restraint of said piston rod, said piston rod also extending tightly through an inner end wall of the cylinder member and (b) a piston dividing the chamber of said cylinder member into an outer end chamber and an inner, annular compartment surrounding a piston rod, whereby said movable cylinder member is guided in a linear movement thereof by the piston and by the piston rod, both compartments being provided with inlet and outlet connections for supply and discharge of a pressure fluid,
a supplementary means for guiding the movable cylinder member, and
wear plates mounted at a bottom of the first squeeze plate.
10. Apparatus for producing casting mould parts by compacting mould material between a first squeeze plate and a second squeeze plate forming movable end walls of a moulding chamber, which subsequent to the compacting can be opened by moving the second squeeze plate out of the way, after which the mould part can be pushed out of the moulding chamber by a further movement of the first squeeze plate in the compacting direction thereof, said apparatus comprising:
a frame;
a hydraulic drive unit which provides the movement of the first squeeze plate, said drive unit comprising
a movable cylinder member connected to the first squeeze plate and
an associated stationary piston member having (a) a piston rod including a distal end and a connection between said distal end and said frame which said connection is rigid and which inherently prevents movement between said distal end and said frame regardless of any other restraint of said piston rod, said piston rod also extending tightly through an inner end wall of the cylinder member and (b) a piston dividing the chamber of said cylinder member into an outer end chamber and an inner, annular compartment surrounding a piston rod, whereby said movable cylinder member is guided in a linear movement thereof by the piston and by the piston rod, both compartments being provided with inlet and outlet connections for supply and discharge of a pressure fluid, and
a supplementary means for guiding the movable cylinder member, wherein the supplementary means for guiding the movable cylinder member is a bearing surface fixed at the inner end wall of the movable cylinder member and a surface co-operating therewith.
9. Apparatus for producing casting mould parts by compacting mould material between a first squeeze plate and a second squeeze plate forming movable end walls of a moulding chamber, which subsequent to the compacting can be opened by moving the second squeeze plate out of the way, after which the mould part can be pushed out of the moulding chamber by a further movement of the first squeeze plate in the compacting direction thereof, said apparatus comprising:
a frame;
a hydraulic drive unit which provides the movement of the first squeeze plate, said drive unit comprising
a movable cylinder member connected to the first squeeze plate and
an associated stationary piston member having (a) a piston rod including a distal end and a connection between said distal end and said frame which said connection is rigid and which inherently prevents movement between said distal end and said frame regardless of any other restraint of said piston rod, said piston rod also extending tightly through an inner end wall of the cylinder member and (b) a piston dividing the chamber of said cylinder member into an outer end chamber and an inner, annular compartment surrounding a piston rod, whereby said movable cylinder member is guided in a linear movement thereof by the piston and by the piston rod, both compartments being provided with inlet and outlet connections for supply and discharge of a pressure fluid, and
a supplementary means for guiding the movable cylinder member, wherein the supplementary means for guiding the movable cylinder member is a number of rollers connected to the movable cylinder member at the inner end wall thereof, said rollers co-operating with corresponding linear roller-supporting surfaces provided on the frame.
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The present invention relates to an apparatus for producing casting mould parts by compacting mould material between a first squeeze plate and a second squeeze plate forming movable end walls of a moulding chamber, which subsequent to the compacting can be opened by moving the second squeeze plate out of the way, after which the mould part can be pushed out of the moulding chamber by a further movement of the first squeeze plate in the compacting direction thereof.
In apparatuses for producing casting mould parts of this kind, it is known to have the first squeeze plate guided by the piston, the piston rod and the cylinder member, the latter directly connected to the first squeeze plate. An apparatus of this kind is e.g. known from EP-020,082. In order to improve the guidance of the first squeeze plate, it is also known to provide the squeeze plate with wear plates along the edges, said wear plates engaging the surfaces of the moulding chamber during the compacting step, thereby reducing the possibilities of a transverse movement of the patterns and a consequent shift between the produced mould parts. However, this will not prevent a certain sag of the piston rod and cylinder member when the cylinder member is advanced to the full extent to push out the produced mould part, such sag potentially leading to tear off at the produced mould part surface in engagement with the squeeze plate or a pattern plate mounted thereon. Furthermore, the wear plates are not able to prevent a tilting movement of the squeeze plate when using an unsymmetrical pattern and the wear plates cause a substantial continuous wear, not only on the wear plates, but also on the surfaces of the chamber in engagement therewith. Furthermore, the chamber will normally be provided with a certain draft in order to facilitate the pushing out of the produced mould and accordingly, the fitting tolerances between wear plates and chamber wall will be dependent on the position of the squeeze plate and not necessarily at an optimum during the compacting. Differences in temperature and in thermal expansion coefficient for the different components may further influence the above fitting tolerances.
It is an object of the present invention to provide an apparatus of the kind referred to above, with which it is possible to reduce the sag of the piston rod and cylinder member and possibly avoiding the use of at least some of the wear plates along the edges of the squeeze plate, and this object is achieved with an apparatus of said kind which according to the present invention also comprises a supplementary means for guiding the cylinder member. With this arrangement, the cylinder member is supported, not only by the piston and piston rod, but also by the supplementary guiding means, supporting and guiding the cylinder member directly and possibly supporting the piston and piston rod indirectly via said cylinder member. Preferred embodiments of the invention are revealed and the advantages thereof are revealed in the following detailed description.
In the following detailed part of the present description, the invention will be explained in more detail with reference to the exemplary embodiments of an apparatus for producing casting mould parts according to the invention shown in the drawings, in which
The apparatus schematically and partly shown in
Hydraulic fluid for moving the cylinder member 2 is supplied and discharged through hydraulic connections 14 through the piston rod 4 connected to a fixed part of the apparatus.
In the embodiment shown in
In the embodiments shown in
In the embodiment shown in
In the embodiment shown in
Although the invention above has been described in connection with specific embodiments thereof, shown in the drawing, it will be evident for a man skilled in the art that other possibilities for providing supplementary means for guiding the movable cylinder member 2 may be envisaged, among such possibilities are the provision of the bearing 11 and bearing surface 12 in the form of bearing surfaces with a polygonal cross-section and possibly combinations of the different embodiments shown in
Mogensen, Vagn, Jacobsen, Ole Anders
Patent | Priority | Assignee | Title |
7806161, | Dec 08 2006 | WAUPACA FOUNDRY, INC | Molding and casting machine |
Patent | Priority | Assignee | Title |
4437507, | Aug 11 1981 | Molding machine | |
4442882, | Sep 06 1980 | MICHAEL ACHINGER, BGM -EBNERSTR 20, | Machine for producing flaskless molds |
4721148, | Jan 03 1986 | DISA INDUSTRIES A S | Moulding system for making mould parts |
793860, |
Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Mar 31 2000 | Disa Industries A/S | (assignment on the face of the patent) | / | |||
Aug 13 2002 | JACOBSEN, OLE ANDERS | DISA INDUSTRIES A S | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 013322 | /0910 | |
Aug 13 2002 | MOGENSEN, VAGN | DISA INDUSTRIES A S | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 013322 | /0910 |
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